| 摘要 |
A hydraulically controlled device to transit measurements taken at the bottom of a well to the surface, by means of pressure impulses created by periodical restrictions on the passage of the drilling fluid, consisting of means to control these restrictions, operated by electrical impulses, a hydraulic fluid circuit to operate the means restricting the passage of the drilling fluid, a turbine driven by the drilling fluid and a hydraulic fluid pump fixed on the same shaft, characterized by the fact that the said pump is placed in a hydraulic fluid circuit containing passages to discharge the fluid on either side of a double-action hydraulic jack, to which said restricting means is mechanically connected, and an accumulator is mounted in said circuit in parallel with said jack.
|
